American parcel duties are permanent, so British online sellers should price them in

The strongest reason to wait is that American tariff policy has changed legal basis three times since early 2025, and the sceptics are right that nobody should hard-code a duty rate. But the rate and the route are different things. Through every one of those changes the duty-free parcel route has stayed shut, the additional US duty on most British goods has stayed at 10%, now under Section 301 since 24 July 2026, and the data a parcel needs to clear has only grown. A retailer's own government's guidance already warns that low-value exports to the US face tariffs, customs clearance and additional data requirements. The work that survives any future rate change is the product data and the checkout, and that work sits with the person who owns the product information system, the storefront and the carrier integrations.

Three legal bases in eighteen months, and the parcel route never reopened

The exemption ended for every country on 29 August 2025, following an executive order of 30 July 2025. The One Big Beautiful Bill Act then terminates the statutory exemption from 1 July 2027. On 24 June 2026 US Customs and Border Protection published an interim final rule writing an indefinite suspension into its own regulations for every mode except the post, and a companion rule for mail did the same for postal parcels. When a statute and two agency rules point the same way, waiting for the weather to change means waiting for something already decided.

This matters to British firms at scale. The British Chambers of Commerce put UK goods shipped to America under the exemption at around US$5 billion in 2021, with roughly 80% moving through e-commerce. HMRC figures cited by the BBC show around 28,000 small businesses with fewer than 49 staff exported goods to the US in 2023. Across all countries, CBP processed over 1.36 billion de minimis shipments in fiscal year 2024, against 139 million in 2015, which is why Washington regards the old route as a problem to close rather than a courtesy to restore.

The strongest objection is that American trade policy keeps reversing

A sceptical finance director has a fair case for patience. On 20 February 2026 the Supreme Court held that the International Emergency Economic Powers Act does not authorise the President to impose additional tariffs. The administration replaced those duties the same day with a temporary 10% global surcharge under Section 122, which the Court of International Trade then ruled unlawful on 7 May 2026, a decision stayed pending appeal. When Section 122 expired, the US Trade Representative imposed new Section 301 duties of 10% or 12.5% on 60 economies, with the UK placed in the 10% tier. If the legal foundation can move that often, why rebuild a checkout around it?

There is a second honest objection, which is that for some businesses leaving the US is the rational answer. The Federation of Small Businesses told the BBC that just over two in ten small firms had stopped, or might stop, exporting there. A hand-dyed wool business in Carmarthenshire that made about 30% of its sales in the US paused them, saying "There is no way of giving the customer an upfront cost." A typical US$100 order, an adviser at Menzies estimated, could pick up US$30 to US$50 in extra costs before carrier handling fees.

Both objections are partly right. Rates have moved, and anyone who priced in a particular percentage during 2025 has repriced at least once. Some low-margin lines will not survive the extra cost, and dropping them is a sound decision. What neither objection touches is the route. CBP's June rule records that the Supreme Court judgment did not address the suspension of the de minimis exemption; Executive Order 14388, signed the day of the ruling, continued the suspension regardless of value, origin or mode; and CBP says it acts under its own customs authority in any case. Notice too what the wool seller's complaint actually was. It was not the duty, it was the inability to quote it. That is a technology problem, and it is solvable.

What technology leaders should change, and by when

Before the end of 2026, make the 10-digit US tariff classification and the country of origin mandatory fields on every variant in the product information system, with component origin recorded where metal content or Section 232 duties apply. Treat them as controlled master data that only trained staff can change, not text typed at the packing bench. The postal informal entry rule already requires the filer to send CBP a monthly spreadsheet listing each item's description, country of origin, all applicable 10-digit classifications, duty rate, value and duty owed, with payment through Pay.gov by the 7th of the following month.

Before 20 January 2027, check whether anything in the US range falls into the categories CBP has singled out. Postal goods subject to partner agency requirements, or to duties under chapters 98 or 99 of the US tariff schedule, must use formal entry from that date, after CBP extended the compliance deadline from October 2026. Ask each carrier and broker, in writing, what data its API expects for those goods and what happens to a parcel when the data is missing.

Before 1 July 2027, make delivered duty paid the default for US orders, with a landed-cost quote returned at the basket from the carrier or broker integration and US prices set in dollars with duty inside the figure. Then run a per-SKU margin report and decide deliberately which lines stop being offered to American customers, rather than discovering the answer in a refund log.

Who pays at the door decides whether the customer comes back

Under the old system, the price on a British website was, near enough, the price an American paid. UK guidance now describes two models. Under delivered duty paid the seller covers all costs; under delivered duty unpaid the buyer meets the charges on arrival. Duty unpaid looks cheaper on a spreadsheet and is usually worse in practice. A customer who clicked buy at £45 and then receives a demand for duty plus a handling fee before the courier hands over the box may refuse the parcel, raise a chargeback or simply never order again. Returns from the US are slow and dear. A seller who builds duty into the shelf price keeps control of what the customer experiences and can negotiate clearance fees on volume.

Postal shipping is not a reliable escape. The flat per-item postal duty the White House described in 2025 was only open to postal network operators, and CBP noted that only 5% of de minimis shipments entered through the mail. The new postal process now asks for the same classification data as a courier entry, so the channel choice changes the paperwork route, not the data requirement.

What the money tells you about enforcement appetite

Agencies keep doing things that pay. By 17 December 2025 CBP said it had collected over US$1 billion in duties on over 246 million low-cost shipments since the phaseout began, and that seizures of unsafe and non-compliant low-value goods had risen by 82%. The White House said that in fiscal year 2024 90% of all cargo seizures originated as de minimis shipments. British goods were a small part of that, but a customs service with those numbers in its rulemaking record has no reason to offer a carve-out to any single trading partner. A ceramics studio sending a US$60 mug to Portland is nobody's idea of a smuggling risk, and it still joins the same queue.

Product data is now part of the product

A full customs process, says the UK guidance, requires accurate product descriptions, country of origin for each item and its component parts, and Harmonized System codes, with fields that used to be optional now compulsory. A silver necklace with a British-made pendant on an imported chain has two origins. A gift box with a candle, a tin of tea and a printed card is three classifications in one parcel. Courier entries for low-value goods must now use formal or informal entry procedures rather than a manifest line, so a wrong code is no longer free. Plenty of shops have SKUs, prices and pictures in good order and little else, because for years nothing turned on the label description. That habit now costs money at the border.

A paperwork deal is the realistic hope, and it still needs clean data

If there is a softer future, it will most likely come from the paperless trade and pre-arrival processing talks promised in the Economic Prosperity Deal. Faster digital clearance for trusted British exporters is worth having, and the Department for Business and Trade should push for it. Every version of that deal, though, rewards the seller whose data is already accurate and machine-readable, because pre-arrival processing only works when there is something correct to process before arrival.

So the investment a sceptic fears wasting is the price of entry to any improvement. A retailer that cleans its classification and origin data and wires landed cost into checkout this winter is ready whatever the next tariff authority turns out to be. One that waits will be first in the queue for neither. Whether the US eventually offers trusted small exporters a lighter lane is the part I cannot predict, and I would rather British technology teams built for the law as written than for a hope.